Expanded and independent validation of the Movement Disorder Society–Unified Parkinson’s Disease Rating Scale (MDS-UPDRS)

Validation of the MDS-UPDRS Part I for nonmotor symptoms in Parkinson's disease

(2011) David A. Gallagher et al.   MOVEMENT DISORDERS

The COSMIN checklist for evaluating the methodological quality of studies on measurement properties: A clarification of its content

(2010) Lidwine B Mokkink et al.   BMC Medical Research Methodology

Linking measurement error to minimal important change of patient-reported outcomes

(2009) Caroline B. Terwee et al.   JOURNAL OF CLINICAL EPIDEMIOLOGY

International study on the psychometric attributes of the Non-Motor Symptoms Scale in Parkinson disease

(2009) P. Martinez-Martin et al.   NEUROLOGY

Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale (MDS-UPDRS): Scale presentation and clinimetric testing results

(2008) Christopher G. Goetz et al.   MOVEMENT DISORDERS

The clinical impression of severity index for Parkinson's disease: International validation study

(2008) Pablo Martínez-Martín et al.   MOVEMENT DISORDERS

Standard error of measurement as a valid alternative to minimally important difference for evaluating the magnitude of changes in patient-reported outcomes measures

(2007) Javier Rejas et al.   JOURNAL OF CLINICAL EPIDEMIOLOGY